'Grey's Anatomy' star explains wedding

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Sandra Oh has explained the reasons for Cristina's upcoming wedding on Grey's Anatomy.

Earlier this year, it emerged that Cristina will marry Owen (Kevin McKidd) in the season seven premiere.

Oh has now explained that Cristina decides to tie the knot because of the shootings in the last finale.

"Big life things happen when people go through traumatic events that are life and death," she told People. "You understand what is important to you. [Cristina] decides to get married based on an essential need to be safe."

Oh also revealed that the ceremony is "relaxed and casual" and joked that the cast enjoyed the chance to dress up.

"Everyone [was] looking so great and glam," she said. "It's rare for us!"

The season premiere of Grey's Anatomy will air on September 23 on ABC.